Tungsten-base alloy material and preparation method therefor

A preparation method for a tungsten-base alloy material, comprising the following steps:

• 1) A composite powder is evenly ground then subjected to an annealing treatment at a temperature of 700 to 1000° C. to obtain a powder A;
• the composite powder is a powder I, a powder II or a powder III;
• the powder I contains tungsten, zirconium oxide, nickel and iron;
• the powder II contains tungsten, zirconium oxide, and a nickel-iron solid solution;
• the powder III contains tungsten, zirconium oxide, and a zirconium hydride-containing nickel-iron solid solution;
• a mass ratio of a nickel element and an iron element in the composite powder is 7:2 to 5;
• 2) The powder A is ground and compression-moulded into a shape, and then liquid-phase sintered to obtain a tungsten-base alloy blank,
• wherein the powder I is obtained by mixing an iron powder, a nickel powder and a mixed powder as main raw materials;
• the powder II is obtained by mixing a nickel-iron solid solution powder and a mixed powder as main raw materials;
• and the powder III is obtained by mixing the zirconium hydride-containing nickel-iron solid solution and a mixed powder;
• the mixed powder used to prepare the powder I, the powder II, and the powder III is prepared by a method comprising the following steps:
• i) a tungsten trioxide suspension and a hydrogen zirconium oxide suspension are prepared:
• a) ammonium metatungstate is formulated into a precursor solution A with a pH≤1, and then the precursor solution A is subjected to a hydrothermal reaction to obtain the tungsten trioxide suspension;
• b) zirconium nitrate is formulated into a precursor solution B with a pH of 11 to 13, and then the precursor solution B is subjected to a hydrothermal reaction to obtain the hydrogen zirconium oxide suspension;
• ii) then the tungsten trioxide suspension and the hydrogen zirconium oxide suspension are mixed uniformly, a solvent is removed to make a powder, and then the powder is sequentially sintered and reduced to obtain the mixed powder.